Megan Fox: ‘I Am A Stepmother To The Fullest Extent’

March 3, 2010 9:07 AM PST

Megan Fox may be known for her bombshell performances in the “Transformers” film franchise and as the demonic title character in “Jennifer’s Body,” but the star says there’s one role people haven’t publicly seen her play yet.

“I am a stepmother to the fullest extent,” she told the April issue of Harper’s Bazaar UKof her relationship with boyfriend Brian Austin Green’s 8-year-old son, Kassius. The full feature appears in the issue, due on shelves on March 4. “I have looked after Kassius since he was 3 and he has no memory of life without me. For some reason, no one wants to look at me that way, but I am responsible [for him]. I’ve never struggled with that, from bedtime stories to the school run.”

Megan – the latest face of Emporio Armani Underwear and Jeans — also told the mag that she didn’t have the energy to keep up her pin-up image in everyday life.

“It would be nice to be like Rihanna and go to Burger King in six-inch heels and a mini-dress,” she said. “It’s admirable. But I don’t have the motivation.”

And while she’s one of Hollywood’s sexiest stars, she told the mag she’s not one to sleep around.

“I’ve only been with two men my entire life,” she said. “My childhood sweetheart and Brian.”

And the star said the idea of sex with someone she’s not committed to makes her “sick.”

“I can never have sex with someone I don’t love, ever,” she said. “The idea makes me sick. I’ve never even come close to having a one-night stand.”